>=20 > If you're making a product, don't screw it all up with systems=20 > requirements from the 1990s. >=20 > I will avoid any product if I can't run the user software or a=20 > development environment from a virtual machine. There's no excuse for=20 > that these days. >=20 >=20 > Darron >=20 So I guess you are not using Modbus over RS485 or RS232? Continuous stream of data and 3.5 character silence to mark end of frame. /Ruben --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .